Titanium metal pipe three-gas synchronous welding control system and method

Abstract

The application discloses a titanium metal welded pipe three-gas synchronous welding control system and method, relates to the technical field of welding optimization, and comprises the following modules: a welding process parameter determination module, which is used for determining the welding process parameters of a target titanium metal welded pipe; a three-gas protection structure determination module, which is used for determining a three-gas protection structure cooperating with an automatic TIG welding device; a welding simulation module, which is used for welding simulation and determining welding characteristic information; a gas flow demand prediction module, which is used for three-way protection gas flow demand prediction and three-way protection gas flow parameter generation; and a welding control module, which is used for welding control and synchronous control of the three-gas protection structure. The technical problems that the welding process parameters are difficult to accurately match, welding protection is not comprehensive, and gas flow parameters cannot be dynamically adjusted, resulting in unstable welding quality, high scrap rate and low production efficiency are solved, and the technical effects of improving welding quality, reducing the scrap rate and improving production efficiency are achieved.

Description

Technical Field

[0001] This application relates to the technical field of welding optimization, specifically to a three-gas synchronous welding control system and method for titanium metal welded pipes. Background Technology

[0002] From a welding process perspective, food-grade titanium is chemically reactive and readily reacts with oxygen, nitrogen, and hydrogen in the air during welding, leading to defects such as porosity and cracks in the weld area. This reduces the mechanical properties and corrosion resistance of the welded joint. Traditional welding processes struggle to precisely match the processing requirements of different specifications and performance requirements of food-grade titanium welded pipes, resulting in unstable welding quality and a high scrap rate. Furthermore, improper heat input control during welding can alter the microstructure and properties of titanium, affecting the overall quality of the welded pipe. From a welding protection perspective, existing welding protection structures and shielding gases cannot provide comprehensive and effective protection for the arc area of ​​the welding torch, the back of the weld, and the slow cooling zone. This fails to meet the specific requirements of welding food-grade titanium welded pipes, causing titanium to oxidize and nitrid at high temperatures. Moreover, the shielding gas flow parameters cannot be dynamically adjusted according to actual needs during welding, making it impossible to achieve efficient energy utilization while ensuring welding quality.

[0003] Therefore, current technologies suffer from technical problems such as difficulty in accurately matching welding process parameters, incomplete welding protection, and inability to dynamically adjust gas flow parameters, resulting in unstable welding quality, high scrap rate, and low production efficiency. Summary of the Invention

[0004] This application provides a three-gas synchronous welding control system and method for titanium metal welded pipes, which solves the technical problems in the prior art, such as difficulty in accurately matching welding process parameters, incomplete welding protection, and inability to dynamically adjust gas flow parameters, which lead to unstable welding quality, high scrap rate, and low production efficiency. It achieves the technical effects of improving welding quality, reducing scrap rate, and increasing production efficiency.

[0005] This application provides a three-gas synchronous welding control system for titanium metal welded pipes. The system includes: a welding process parameter determination module for determining the welding process parameters of an automatic TIG welding equipment used to process a pre-processed food-grade titanium plate for the target titanium metal welded pipe; a three-gas shielding structure determination module for determining the three-gas shielding structure that cooperates with the automatic TIG welding equipment; a welding simulation module for performing welding simulation of the target titanium metal welded pipe based on the welding process parameters, determining welding characteristic information, including the movement and thermal characteristics of the welding torch arc area, the back surface area of ​​the weld, and the slow cooling area of ​​the weld; a gas flow demand prediction module for predicting the three-gas shielding gas flow demand of the three-gas shielding structure based on the welding characteristic information, generating three-gas shielding gas flow parameters corresponding to the welding process parameters; and a welding control module for synchronously controlling the three-gas shielding structure according to the three-gas shielding gas flow parameters when the automatic TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate through the welding process parameters.

[0006] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system also performs the following process: the pre-processed food-grade titanium plate is a titanium plate processed to a preset round pipe diameter by a rolling machine, and the rolling machine works in conjunction with the automatic TIG welding equipment and the three-gas protection structure.

[0007] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system further performs the following processing: the three-gas protection structure includes three protection channels, namely a main argon gas protection channel, a back auxiliary gas protection channel, and an outer ring flexible drag shield protection channel; wherein, the main argon gas protection channel is located in the TIG welding torch body in the automatic TIG welding equipment and is used to wrap the welding arc area, and the gas output position of the main argon gas protection channel changes with the welding position of the TIG welding torch body; the back auxiliary gas protection channel includes an in-pipe blowing system for supplying argon gas with a preset purity to the target titanium metal welded pipe; the outer ring flexible drag shield protection channel includes a flexible shield installed behind the TIG welding torch and a gas source for blowing gas into the flexible shield, the flexible shield being made of metal or ceramic.

[0008] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system further performs the following processing: sequentially extracting the movement and thermal characteristics of the welding torch arc region, the weld back side region, and the welding slow cooling region from the welding feature information to generate arc region dynamic characteristics, back side region dynamic characteristics, and slow cooling region dynamic characteristics; based on the arc region dynamic characteristics, calling a preset main argon gas protection relationship library to perform real-time flow and pressure matching of the main argon gas protection channel to generate a first flow parameter; based on the back side region dynamic characteristics, performing flow and delay matching of the back auxiliary gas protection channel to generate a second flow parameter; based on the slow cooling region dynamic characteristics, performing flow and delay protection length matching of the outer ring flexible drag shield protection channel to generate a third flow parameter; and generating the three protective gas flow parameters using the first flow parameter, the second flow parameter, and the third flow parameter.

[0009] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system also performs the following processing: delay matching includes the time for gas protection to be turned on in advance before welding arc ignition and delayed after arc extinguishing; protection length matching includes the time length of gas protection in the drag shield area.

[0010] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system further performs the following processes: determining the auxiliary gas addition temperature threshold for the back weld area; based on the preset pipe diameter and pipe length, taking the gas flow outlet of the back auxiliary gas protection channel as the starting point, analyzing the diffusion characteristics of the gas flow from the starting point to the outside of the pipe; determining the time and flow rate parameters for the gas protection to be turned on in advance before welding arc ignition based on the movement characteristics of the weld back area within the dynamic characteristics of the back area and the diffusion characteristics; determining the heat dissipation characteristics of the pre-processed food-grade titanium plate, and determining the delay shut-off time after arc extinguishing by combining the thermal characteristics of the weld back area and the auxiliary gas addition temperature threshold; generating the second flow rate parameter using the advance turn-on time, flow rate parameter, and delay shut-off time.

[0011] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system also performs the following processing: receiving a preset weld cooling temperature; using the dynamic characteristics of the slow cooling zone as a starting point and the preset weld cooling temperature as an end point, matching the cooling time based on the heat dissipation characteristics to generate a delayed protection length; based on the delayed protection length, and constrained by the fact that the protective gas concentration inside the flexible cover in the outer ring flexible drag cover protection channel meets a preset concentration threshold, determining the flow parameters and generating the third flow parameters.

[0012] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system also performs the following processing: collecting welding modeling data of the automatic TIG welding equipment and constructing a twin welding model; inputting the welding process parameters into the twin welding model to simulate the welding process, and extracting the movement and thermal characteristics of the welding torch arc area, the back surface area of ​​the weld, and the slow cooling area of ​​the weld from the welding simulation results to generate the welding feature information.

[0013] In a possible implementation, the titanium metal welded pipe three-gas synchronous welding control system also performs the following processing: the welding torch arc area is the area where the arc contacts the metal during the welding process; the back area of ​​the weld is the area corresponding to the position of the pre-processed food-grade titanium plate inner wall; and the welding slow cooling area is the area where the welding operation is completed but has not cooled to the preset safe temperature.

[0014] This application also provides a method for simultaneous three-gas welding control of titanium metal welded pipes, comprising: determining the welding process parameters of an automatic TIG welding equipment for processing a pre-processed food-grade titanium plate for the target titanium metal welded pipe; determining a three-gas protection structure that cooperates with the automatic TIG welding equipment; performing welding simulation of the target titanium metal welded pipe based on the welding process parameters to determine welding characteristic information, including the movement and thermal characteristics of the arc region of the welding torch, the back surface region of the weld, and the slow cooling region of the weld; predicting the demand for three-way protective gas flow for the three-gas protection structure based on the welding characteristic information, and generating three-way protective gas flow parameters corresponding to the welding process parameters; and when the automatic TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate through the welding process parameters, synchronously controlling the three-gas protection structure according to the three-way protective gas flow parameters.

[0015] The proposed control system and method for simultaneous three-gas welding of titanium welded pipes includes: a welding process parameter determination module for determining the welding process parameters of the target titanium welded pipe; a three-gas shielding structure determination module for determining the three-gas shielding structure to cooperate with the automatic TIG welding equipment; a welding simulation module for performing welding simulation and determining welding characteristic information; a gas flow demand prediction module for predicting the demand for the three-gas shielding gas and generating the parameters for the three-gas shielding gas; and a welding control module for controlling the welding process and synchronously controlling the three-gas shielding structure. This solves the technical problems in existing technologies, such as difficulty in accurately matching welding process parameters, incomplete welding protection, and the inability to dynamically adjust gas flow parameters, leading to unstable welding quality, high scrap rate, and low production efficiency. It achieves the technical effects of improving welding quality, reducing scrap rate, and increasing production efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. Flowcharts are used in this application to illustrate the operations performed by the system according to the embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously as needed. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.

[0017] Figure 1 This is a schematic diagram of the three-gas synchronous welding control system for titanium metal welded pipes provided in an embodiment of this application.

[0018] Figure 2 A schematic diagram of the three-gas synchronous welding control method for titanium metal welded pipes provided in the embodiments of this application.

[0019] Explanation of reference numerals in the attached diagram: Welding process parameter determination module 10, three-gas shielding structure determination module 20, welding simulation module 30, gas flow demand prediction module 40, welding control module 50. Detailed Implementation

[0020] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below.

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application will be provided in conjunction with the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the following description, references to "some embodiments" describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same or different subsets of all possible embodiments and can be combined with each other without conflict. The terms "first" and "second" are used merely to distinguish similar objects and do not represent a specific ordering of objects. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, system, product, or server that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, products, or devices. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only.

[0023] This application provides a three-gas synchronous welding control system for titanium metal welded pipes, such as... Figure 1 As shown, the system includes: The welding process parameter determination module 10 is used to determine the welding process parameters of the automatic TIG welding equipment for pre-processed food-grade titanium plates used to process the target titanium metal welded pipe.

[0024] Preferably, the welding process parameters of the automatic TIG welding equipment are determined, including welding current, voltage, welding speed, shielding gas flow rate, tungsten electrode diameter and shape, nozzle diameter, etc. These parameters are determined based on specific conditions such as the thickness, material, and pipe diameter of the titanium plate. Specifically, the welding current directly affects the stability of the welding arc and heat input. Welding food-grade titanium plates requires precise adjustment of the welding current based on the thickness, material, and welding position of the titanium plate. Welding thicker titanium plates requires a larger current to ensure sufficient weld penetration. The welding voltage and welding current work together to determine the shape and energy distribution of the welding arc. A suitable welding voltage ensures stable arc combustion and good weld formation. The welding speed affects weld quality and production efficiency. If the welding speed is too fast, the arc will not heat the titanium plate sufficiently, resulting in insufficient weld penetration and width, and weak bonding between the weld metal and the base metal. Conversely, if the welding speed is too slow, the weld will overheat, resulting in coarse grains, affecting the mechanical properties of the weld, and reducing production efficiency. For example, when the pre-processed food-grade titanium plate is 1.0 mm thick and the target round tube diameter is 50 mm, the welding current is set to 80~100A, the welding voltage is 12~15V, the welding speed is 200~300 mm / min, the tungsten electrode diameter is 2.4 mm, and the nozzle diameter is 10 mm. These parameters are optimized through welding experiments and metallographic analysis of the weld cross-section.

[0025] Preferably, the tungsten electrode is the electrode that generates the electric arc in TIG welding. Its diameter and shape affect the stability of the arc and the heat distribution. For welding food-grade titanium plates, the appropriate diameter of the tungsten electrode needs to be selected based on the welding current. For high-current welding, a larger diameter tungsten electrode should be used to avoid overheating and burning. Different shapes will result in varying arc concentration and heat distribution, such as the tip angle and end shape. The shielding gas prevents the titanium metal at high temperatures from reacting with harmful gases such as oxygen, nitrogen, and hydrogen in the air, ensuring the purity and performance of the weld metal. The flow rate of the shielding gas is adjusted according to the welding current, welding speed, welding position, and the structure of the workpiece. Excessive flow rate leads to gas waste; insufficient flow rate fails to effectively protect the weld, resulting in weld oxidation. The nozzle diameter determines the coverage and protective effect of the shielding gas. Selecting an appropriate nozzle diameter can improve welding flexibility and efficiency while ensuring effective protection.

[0026] The three-gas protection structure determination module 20 is used to determine the three-gas protection structure that works with the automatic TIG welding equipment.

[0027] Furthermore, the specific configuration of the three-gas protection structure determination module 20 also includes that the three-gas protection structure includes three protection channels, namely a main argon gas protection channel, a back auxiliary gas protection channel, and an outer ring flexible drag shield protection channel; wherein, the main argon gas protection channel is located in the TIG welding torch body in the automatic TIG welding equipment and is used to wrap the welding arc area, and the gas output position of the main argon gas protection channel changes with the welding position of the TIG welding torch body; the back auxiliary gas protection channel includes an internal gas blowing system for supplying argon gas with a preset purity to the target titanium metal welded pipe; the outer ring flexible drag shield protection channel includes a flexible shield installed behind the TIG welding torch and a gas source for blowing gas into the flexible shield, the flexible shield being made of metal or ceramic.

[0028] Preferably, the three-gas protection structure includes three protection channels: a main argon gas protection channel, a back auxiliary gas protection channel, and an outer ring flexible drag shield protection channel. These three protection channels work together to provide comprehensive gas protection for the welding process of the target titanium metal welded pipe, preventing the titanium metal from reacting with oxygen, nitrogen, and other gases in the air at high temperatures, thereby ensuring the quality and performance of the weld. The main argon gas protection channel is located on the TIG welding torch body in the automatic TIG welding equipment. It is used to surround the welding arc area, providing a stable protective gas environment for the welding arc. Specifically, argon gas is output from the main argon gas protection channel, forming a protective gas layer around the welding arc, isolating the air and preventing harmful gases in the air from contaminating the weld pool, ensuring the stability of the welding process and the quality of the weld. The gas output position of the main argon gas protection channel changes with the welding position of the TIG welding torch body, enabling real-time effective protection of the welding arc area. Regardless of how the welding torch moves, the protective gas accurately covers the welding area.

[0029] Preferably, the back auxiliary gas protection channel includes an in-pipe blowing system for supplying argon gas of a preset purity to the target titanium metal welded pipe. Not only does the welding arc area need protection during the welding process, but the back side of the weld is also susceptible to oxidation and other problems caused by air. Specifically, the back auxiliary gas protection channel forms a protective gas layer on the back side of the weld by supplying high-purity argon gas to the target titanium metal welded pipe, preventing the back weld from contacting air and ensuring the quality of the back side of the weld. The preset purity argon gas can effectively isolate air, prevent impurities from entering the weld, and improve the reliability of the weld.

[0030] Preferably, the outer ring flexible drag shield protection channel includes a flexible shield installed behind the TIG welding torch and an air source for blowing air into the flexible shield. The flexible shield is made of metal or ceramic and has good high-temperature resistance and gas sealing performance. It is used to effectively protect the slow-cooling area of ​​the weld after welding. Specifically, during the cooling process after welding, the weld may still be affected by harmful gases in the air, which may lead to a decrease in weld performance. The outer ring flexible drag shield protection channel blows air into the flexible shield to form a protective gas layer in the slow-cooling area of ​​the weld, slowing down the cooling rate of the weld, making the weld structure more uniform, and improving the mechanical properties of the weld.

[0031] Furthermore, the specific configuration of the three-gas protection structure determination module 20 also includes that the pre-processed food-grade titanium plate is a titanium plate processed to a preset circular tube diameter by a rolling machine, and the rolling machine works in conjunction with the automatic TIG welding equipment and the three-gas protection structure.

[0032] Preferably, the pre-processed food-grade titanium plate is a titanium plate processed to a preset circular tube diameter by a rolling machine. This means that the original flat food-grade titanium plate is rolled by the rolling machine and then welded using automatic TIG welding equipment. Specifically, the rolling machine and the automatic TIG welding equipment are first inspected and debugged, including checking whether the roller spacing, drive system, and hydraulic system of the rolling machine are normal to ensure precise control of the rolling diameter; the welding power supply, welding torch, and traveling mechanism of the automatic TIG welding equipment are debugged to ensure stable and adjustable welding parameters. The machine operates reliably. Then, the titanium plate is rolled into a target food-grade titanium welded pipe with a preset diameter using a rolling mill. The rolling accuracy and surface quality of the titanium plate are ensured to avoid wrinkles, deformation, etc. Specifically, the size of the titanium plate is determined according to the specifications of the target titanium welded pipe, and necessary pretreatment is performed, such as sanding the welding parts with sandpaper and wiping with acetone to remove oil stains. Based on the material, thickness, diameter and other requirements of the target titanium welded pipe, and in combination with the performance of the equipment, the rolling process parameters of the rolling mill are determined, such as the feed speed and pressure of the rollers.

[0033] Preferably, the pre-treated food-grade titanium plate is placed stably on a rolling machine, and the titanium plate is fixed with clamps or positioning devices to ensure accurate positioning and no displacement during the rolling process. The rolling machine is started, and the titanium plate is gradually rolled into a cylindrical shape through the rotation and feed motion of the rollers according to the set process parameters. The diameter of the rolled tube is monitored in real time during the rolling process. By adjusting the roller spacing or feed speed, the diameter of the rolled tube reaches the preset target value. At the same time, the deformation of the titanium plate is observed to prevent defects such as wrinkles and twists. After the rolling is completed, the dimensions of the rolled tube are checked with measuring tools (such as calipers, roundness testers, etc.), including parameters such as the diameter, roundness, and length of the tube, to ensure that it meets the design requirements of the target titanium metal welded pipe.

[0034] Preferably, the rolled titanium tube is accurately placed on the welding station of the automatic TIG welding equipment, and a special clamp is used to fix the titanium tube to ensure a tight fit at the weld joint and that it is in a suitable welding position. Simultaneously, it is ensured that the welding torch of the welding equipment is accurately aligned with the weld joint. The automatic TIG welding equipment is then started, and welding is performed according to the pre-set welding process parameters. During the welding process, the welding torch moves at a uniform speed along the joint of the titanium tube, causing the edges of the titanium plate to melt and fuse together under the high temperature of the electric arc, forming a continuous weld. If filler material is required, it is accurately fed into the weld pool through the wire feeding system, fully fusing with the base material. During the welding process, the stability of the welding arc and the formation of the weld, such as the width, height, and surface smoothness of the weld, are closely observed. Attention is also paid to the protective effect of the shielding gas to prevent weld oxidation, porosity, and other defects. If any abnormalities are found, the welding parameters are adjusted promptly for correction.

[0035] Preferably, the rolling machine works in conjunction with the automatic TIG welding equipment and a three-gas shielding structure. Specifically, a precise positioning and conveying mechanism is installed between the rolling machine and the automatic TIG welding equipment to ensure the accuracy of the welding position and the stability of the welding quality. For example, the rolling machine accurately places the titanium plate onto the fixture of the automatic TIG welding equipment. The fixture can firmly fix the titanium plate and ensure that the interface of the titanium plate is accurately aligned during welding. The three-gas shielding structure provides effective gas protection during the welding process, preventing the titanium metal from reacting with oxygen, nitrogen, and other gases in the air at high temperatures. When the titanium plate is conveyed to the welding station, the three-gas shielding structure is quickly activated, providing appropriate shielding gas to the arc area of ​​the welding torch, the back area of ​​the weld, and the slow cooling area of ​​the weld according to the preset shielding gas flow parameters, ensuring that the titanium metal is always under good gas protection during the welding process. The rolling machine, the automatic TIG welding equipment, and the three-gas shielding structure work together to ensure that the final processed food-grade titanium welded pipe meets the required quality.

[0036] The welding simulation module 30 is used to perform welding simulation of the target titanium metal welded pipe based on the welding process parameters, and to determine the welding characteristic information, including the movement characteristics and thermal characteristics of the welding torch arc area, the back side area of ​​the weld, and the slow cooling area of ​​the weld.

[0037] Furthermore, the specific configuration of the welding simulation module 30 also includes: collecting welding modeling data from the automatic TIG welding equipment to construct a twin welding model; inputting the welding process parameters into the twin welding model to simulate the welding process; and extracting the movement and thermal characteristics of the welding torch arc area, the back surface area of ​​the weld, and the slow cooling area of ​​the weld from the welding simulation results to generate the welding feature information.

[0038] Preferably, welding data generated during the operation of the automated TIG welding equipment is acquired in real time through sensors and data acquisition components. This data serves as welding modeling data and may include welding current, voltage, welding speed, shielding gas flow rate, tungsten electrode state (such as diameter and temperature), welding torch position and trajectory, etc. Simultaneously, relevant data of the pre-processed food-grade titanium plate being welded, such as material properties, thickness, and shape, are acquired. Then, based on the welding modeling data and the titanium plate data, a twin welding model is constructed using computer simulation. Specifically, a two-dimensional axisymmetric thermal-structural coupling model is established using COMSOL Multiphysics 6.0 software based on the finite element method. The heat source adopts a double ellipsoidal heat source model with a thermal efficiency of 0.75. Boundary conditions include convective and radiative heat transfer. A quadrilateral mesh is used with a minimum mesh size of 0.2 mm. The welding temperature field is obtained by solving the transient heat conduction equation, reflecting the relationship between various parameters during the welding process and the impact of the welding process on weld quality and performance. By adjusting the parameters in the model, the welding process under different welding parameters can be simulated, and the welding results can be predicted. Next, the determined welding process parameters (such as welding current, voltage, welding speed, shielding gas flow rate, etc.) are input into the twin welding model. Based on the input parameters, the twin welding model simulates the heat transfer, metal melting and solidification, gas flow, etc. during the welding process, performs dynamic simulation of the welding process, observes the formation process of the weld, and the changes in temperature field, stress field, etc. in the welding area, and then obtains the welding simulation results.

[0039] Preferably, the movement and thermal characteristics of the welding torch arc region, the back surface region of the weld, and the slow cooling region are extracted from the welding simulation results to generate welding characteristic information. Specifically, the movement characteristics may include the movement speed and trajectory of the welding torch, the movement of the gas shielding device on the back surface of the weld, and the changes in the slow cooling region over time. The thermal characteristics include the temperature distribution, temperature change rate, and range of the heat-affected zone in these regions. This information is then used to optimize welding process parameters and improve welding quality. For example, by analyzing the thermal characteristics, appropriate welding speed and current can be determined to avoid overheating or undercooling of the weld, thereby reducing welding defects. By analyzing the movement characteristics, the position and gas flow rate of the gas shielding device can be optimized to ensure that the welding area is adequately protected.

[0040] Furthermore, the specific configuration of the welding simulation module 30 also includes the following: the welding torch arc area is the area where the arc contacts the metal during the welding process; the back area of ​​the weld is the area corresponding to the inner wall of the pre-processed food-grade titanium plate and the arc position; and the welding slow cooling area is the area where the welding operation is completed but has not cooled to the preset safe temperature.

[0041] Preferably, the welding torch arc zone refers to the area where the arc generated by the welding torch contacts the metal surface of the pre-processed food-grade titanium plate. This area has extremely high temperatures, and the metal rapidly melts under the action of the arc to form a molten pool. The stability, current magnitude, and arc length of the arc affect the temperature distribution in the welding torch arc zone and the shape and size of the molten pool, thus affecting the quality of the weld. For example, suitable arc parameters can maintain good fluidity of the molten pool, ensuring uniform weld depth and width, and avoiding defects such as incomplete penetration and undercut. The back side of the weld refers to the area on the inner wall of the pre-processed food-grade titanium plate corresponding to the arc position. Although the arc mainly acts on the surface of the titanium plate during welding, heat is transferred to the interior of the plate, affecting the back side of the weld as well. Because titanium metal easily reacts with oxygen and nitrogen in the air at high temperatures, high-purity argon gas is supplied to the interior of the titanium plate through the back auxiliary gas protection channel, forming a protective gas layer on the back side of the weld to prevent oxidation and nitriding of the weld metal, ensuring the quality of the back side of the weld. The slow-cooling zone refers to the area where welding has been completed but has not yet cooled to the preset safe temperature. If the cooling rate is too fast, it may cause large internal stress and cracks in the weld metal, and also affect the mechanical properties of the weld. Therefore, by blowing air into the flexible cover through the outer ring flexible drag cover protection channel, a protective gas layer is formed in the slow-cooling zone of the weld, which slows down the cooling rate and allows the weld metal to cool evenly, avoiding defects caused by uneven cooling and improving the quality and performance of the weld.

[0042] The airflow demand prediction module 40 is used to predict the three-way protective airflow demand of the three-gas protective structure based on the welding characteristic information, and generate three-way protective airflow parameters corresponding to the welding process parameters.

[0043] Furthermore, the specific configuration of the airflow demand prediction module 40 also includes: sequentially extracting the movement and thermal characteristics of the welding torch arc region, the weld back side region, and the welding slow cooling region from the welding feature information to generate arc region dynamic characteristics, back side region dynamic characteristics, and slow cooling region dynamic characteristics; based on the arc region dynamic characteristics, calling a preset main argon gas protection relationship library to perform real-time flow and pressure matching of the main argon gas protection channel to generate a first flow parameter; based on the back side region dynamic characteristics, performing flow and delay matching of the back auxiliary gas protection channel to generate a second flow parameter; based on the slow cooling region dynamic characteristics, performing flow and delay protection length matching of the outer ring flexible drag shield protection channel to generate a third flow parameter; and generating the three protective airflow parameters using the first flow parameter, the second flow parameter, and the third flow parameter.

[0044] Preferably, the movement characteristics (such as the movement speed and trajectory of the welding torch, and the movement of the gas shielding device) and thermal characteristics (such as temperature distribution, temperature change rate, heat transfer rate, and heat-affected zone) of the welding torch arc region, the back surface of the weld, and the slow cooling region are extracted sequentially from the welding feature information. Specifically, for the welding torch arc region, image recognition is used to determine the position coordinates of the arc-metal contact point, and the changes in the contact point coordinates in adjacent frames are calculated to obtain the movement speed and trajectory of the arc region. From the temperature data obtained by thermocouples or infrared thermal imagers, parameters such as the highest temperature, average temperature, and temperature gradient of the arc region are determined, and the temperature change trend over time is analyzed. For the back surface of the weld, based on the movement characteristics of the arc region and welding process parameters (such as welding speed and plate thickness), the movement of the back surface of the weld over time is calculated, including movement speed and position changes. Thermocouples are installed on the back surface of the weld or the temperature of the back surface is indirectly measured by infrared thermal imagers, and thermal characteristic parameters such as the temperature distribution, highest temperature, average temperature, and the rate of temperature rise and fall of the back surface are extracted. For the slow-cooling zone, monitoring equipment is used to determine the change in the boundary position of the slow-cooling zone over time, calculate the movement speed and direction of the boundary, and the overall contraction or expansion of the slow-cooling zone as its movement characteristics. Temperature changes in the slow-cooling zone are continuously monitored to obtain temperature curves during the slow-cooling process. From these curves, the cooling rate, temperature values ​​at different times, and heat exchange with the surrounding environment are extracted. Finally, based on these characteristics, dynamic features of the arc zone, the back side zone, and the slow-cooling zone are generated to more accurately reflect the changes in each zone during the welding process.

[0045] Preferably, the preset main argon gas protection relationship library is constructed in the following way: 100 sets of arc area temperature field data under different welding currents (50~200A) and welding speeds (100~500mm / min) are collected. The mapping relationship between arc temperature, arc width, and main argon gas flow rate and pressure is established through regression analysis and stored as a lookup table or multinomial regression model. This model is used to store the correspondence between various characteristics of the arc area in historical data and the flow rate and pressure of the main argon gas protection channel. Specifically, based on the dynamic characteristics of the arc area, the preset main argon gas protection relationship library is called and the real-time flow rate and pressure of the matching main argon gas protection channel are determined. For example, if the temperature of the arc area increases or the moving speed changes, the corresponding adjustment values ​​of the main argon gas flow rate and pressure are determined. Finally, the flow rate and pressure values ​​of the main argon gas protection channel suitable for the current dynamic characteristics of the arc area are obtained as the first flow parameter, thereby ensuring that the main argon gas protection channel can provide appropriate protective gas flow rate and pressure according to the actual situation of the arc area, effectively protecting the welding arc area, preventing metal oxidation, and ensuring welding quality.

[0046] Preferably, the parameters of the back auxiliary gas protection channel are adjusted according to the dynamic characteristics of the back area. This involves performing flow rate and delay matching of the back auxiliary gas protection channel, including adjusting the flow rate of the back auxiliary gas protection channel and performing corresponding delay matching considering the delay in gas delivery. For example, when the temperature of the back area of ​​the weld is high or the welding speed is fast, the flow rate of the back auxiliary gas is increased, and the flow rate is adjusted in advance according to the time required for the gas to be delivered to the designated position to ensure that sufficient protective gas is provided at the appropriate time. This generates a second flow rate parameter suitable for the dynamic characteristics of the back area of ​​the weld, ensuring that the back auxiliary gas protection channel can effectively protect the back of the weld and prevent the metal on the back of the weld from being oxidized or otherwise adversely affected at high temperatures.

[0047] Preferably, the parameters of the outer ring flexible drag shield protection channel are determined based on the dynamic characteristics of the slow cooling zone. This involves matching the flow rate and delayed protection length of the outer ring flexible drag shield protection channel. This includes adjusting the flow rate of the outer ring flexible drag shield protection channel and matching the delayed protection length based on the movement of the slow cooling zone and the required protection length. For example, if the cooling rate of the slow cooling zone is too fast, the gas flow rate of the outer ring flexible drag shield protection channel is increased. Simultaneously, the position of the flexible shield and the gas delivery delay time are adjusted according to the movement speed of the slow cooling zone to ensure that the protective gas continuously provides effective protection during the movement of the slow cooling zone, slowing down the cooling rate and preventing excessive stress and cracks in the weld. This generates a third flow parameter, enabling the outer ring flexible drag shield protection channel to provide the best protection effect according to the actual situation of the slow cooling zone. Finally, the first, second, and third flow parameters are integrated to form a set of three protective gas flow parameters. By adjusting and controlling the gas flow parameters of the three protection channels in real time, precise protection of different critical areas throughout the welding process can be achieved, improving welding quality, reducing welding defects, and ensuring that the welding quality and performance of the target titanium welded pipe meet the requirements.

[0048] Furthermore, the specific configuration of the airflow demand prediction module 40 also includes delay matching, which includes the time for gas protection to be turned on in advance before welding arc ignition and the time for delayed shutdown after arc extinguishing; and protection length matching, which includes the duration of gas protection in the drag shield area.

[0049] Preferably, the metal in the welding area is susceptible to harmful gases such as oxygen and nitrogen in the air at the moment of arc ignition. Therefore, the protective gas supply is turned on in advance before the arc is ignited to isolate the welding area from the air and prevent the metal from being oxidized or nitrided at high temperature, thereby improving the quality of the weld joint. After the arc is extinguished after welding, the protective gas is not turned off immediately, but is delayed for a period of time before it is stopped. This allows the protective gas to continue to provide protection to the welding area during the high-temperature cooling stage after welding, until the metal cools to a relatively safe temperature, thus avoiding defects such as oxidation and porosity on the surface and inside of the weld.

[0050] Preferably, the protection length matching mainly targets the outer ring flexible drag shield protection channel. The duration of gas protection in the drag shield area is matched according to the welding process and specific welding conditions. Specifically, during the welding process, the movement of the welding torch will form a weld seam of a certain length. The drag shield needs to move with the welding torch to provide continuous gas protection for the area that has just been welded. Protection length matching is to precisely adjust the appropriate duration of the protective gas supply in the drag shield during the slow cooling process based on the specific welding materials, welding speed, ambient temperature, etc. If the protection time is too short, the slow cooling area may be exposed to the air before it has fully cooled to a safe temperature, which is prone to defects. If the protection time is too long, it may cause waste of protective gas, increase production costs, and may also affect production efficiency.

[0051] Furthermore, the specific configuration of the airflow demand prediction module 40 also includes: determining the auxiliary gas addition temperature threshold for the back weld area; based on the preset pipe diameter and pipe length, taking the airflow outlet of the back auxiliary gas protection channel as the starting point, analyzing the diffusion characteristics of the airflow from the starting point to the outside of the pipe; determining the time and flow rate parameters for the gas protection to be turned on in advance before welding arc ignition based on the movement characteristics of the weld back area within the dynamic characteristics of the back area and the diffusion characteristics; determining the heat dissipation characteristics of the pre-processed food-grade titanium plate, and determining the delayed shutdown time after arc extinguishing by combining the thermal characteristics of the weld back area and the auxiliary gas addition temperature threshold; and generating the second flow rate parameter using the advance opening time, flow rate parameter, and delayed shutdown time.

[0052] Preferably, the temperature of the back weld area affects the welding quality. Excessively high or low temperatures may lead to weld defects such as oxidation, porosity, and embrittlement. Therefore, a temperature threshold is determined based on historical experience data. When the temperature of the back weld area reaches or exceeds this threshold, auxiliary gas is added for protection to ensure weld quality. When welding a circular tube made of pre-processed food-grade titanium plate, the diffusion of the auxiliary gas from the airflow outlet of the protection channel to the outside of the tube is considered. Specifically, the diameter and length of the tube affect the diffusion path and velocity of the airflow. The diffusion characteristics of the airflow from the outlet, inside and outside the tube, are determined through theoretical analysis (such as fluid mechanics principles). A CFD simulation model of argon gas diffusion inside the tube is established, assuming the gas is an incompressible fluid with an inlet velocity of 5-15 m / s and an outlet pressure of atmospheric pressure. The relationship between gas concentration distribution and diffusion distance is obtained through simulation, and the relationship between diffusion time t and pipe length L and pipe diameter D is fitted: t = α·L 2 / D+β, where α and β are empirical coefficients, for example, to determine the diffusion speed, diffusion range, and distribution of airflow at different locations.

[0053] Preferably, based on the diffusion characteristics of the gas flow and the moving speed of the back side region of the weld, the time required to open the back auxiliary gas protection channel before arc ignition is calculated so that the auxiliary gas can reach and cover the back side region of the weld at the moment of arc ignition, providing timely protection for welding. If the weld moving speed is fast and the gas flow takes a certain amount of time to diffuse to the target area, the auxiliary gas is opened earlier. At the same time, considering the size and shape of the back side region of the weld and the uniformity of gas flow diffusion, appropriate gas flow parameters are determined in combination with diffusion characteristics, and sufficient gas flow is ensured so that the protective gas can form a uniform and effective protective gas layer on the back side of the weld, but the flow rate cannot be too large to avoid waste or adverse effects on the welding process (such as interfering with arc stability).

[0054] Preferably, the heat dissipation rate of the titanium plate under different conditions is measured experimentally using equipment such as a heat flow meter. For example, its thermal conductivity and specific heat capacity are measured using a thermal constant analyzer. The heat dissipation coefficient is obtained by heating the titanium plate to 300°C and then allowing it to cool naturally, recording the temperature-time curve and fitting Newton's law of cooling. Alternatively, it can be calculated theoretically, based on parameters such as the material's thermal conductivity and specific heat capacity, as well as the principles of heat transfer, to determine the heat dissipation characteristics of the pre-processed food-grade titanium plate. Then, based on the heat dissipation characteristics of the titanium plate and the real-time temperature change of the back area of ​​the weld, combined with the auxiliary gas addition temperature threshold, the delay time for shutting off the auxiliary gas is determined. Specifically, when the temperature of the back area of ​​the weld drops to near the auxiliary gas addition temperature threshold, it indicates that the auxiliary gas protection is still needed to prevent the weld from being affected by oxidation during the cooling process. As the temperature continues to drop, when the temperature condition that allows the auxiliary gas protection to be stopped is reached, the auxiliary gas is shut off, thereby precisely controlling the delay time for shutting off the auxiliary gas after the arc is extinguished, ensuring weld quality while avoiding gas waste. Finally, by integrating the pre-start time before arc ignition, appropriate flow parameters, and the delayed shutdown time after arc extinguishing, a second flow parameter is formed. This parameter comprehensively describes the gas supply strategy of the back auxiliary gas shielding channel throughout the welding process, including when to start, at what flow rate, and when to shut it off. This provides accurate and effective gas protection for the back weld area, ensuring that the welding quality meets the requirements.

[0055] Furthermore, the specific configuration of the airflow demand prediction module 40 also includes receiving a preset weld cooling temperature; taking the dynamic characteristics of the slow cooling area as the starting point and the preset weld cooling temperature as the ending point, performing cooling time matching based on heat dissipation characteristics to generate a delayed protection length; and based on the delayed protection length, determining the flow parameters and generating the third flow parameters with the constraint that the protective gas concentration inside the flexible cover in the outer ring flexible cover protection channel meets a preset concentration threshold.

[0056] Preferably, the preset weld cooling temperature is determined according to the characteristics of the welding material and the welding process requirements to avoid structural changes or oxidation of the weld metal at high temperatures; based on the initial temperature of the slow cooling zone (i.e., the current temperature reflected by the dynamic characteristics of the slow cooling zone) and the preset weld cooling temperature, combined with the heat dissipation characteristics of the titanium plate, the time required to cool from the current state to the preset temperature is calculated as the cooling duration, and then the length of time for the weld to be protected by the outer ring flexible drag shield protection channel during the cooling process is determined, that is, the length of the area that the drag shield needs to follow and provide protection for as the weld cools, as the delayed protection length. Then, based on the delayed protection length, and constrained by the requirement that the shielding gas concentration inside the flexible shield within the outer ring flexible drag shield protection channel meets a preset concentration threshold, where the preset concentration threshold is the minimum concentration that the shielding gas inside the flexible shield within the outer ring flexible drag shield protection channel needs to reach, the flow rate parameter that keeps the shielding gas concentration above the preset concentration threshold is determined. Finally, the flow rate parameter and the delayed protection length are integrated to form a third flow rate parameter, which comprehensively describes the gas protection strategy of the outer ring flexible drag shield protection channel during the slow cooling stage of welding, including the protection length range, the required gas flow rate, etc., to ensure that the weld is reliably protected during the cooling process and improve the welding quality.

[0057] The welding control module 50 is used to synchronously control the three-gas protection structure according to the three-way protective gas flow parameters when the automatic TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate by the welding process parameters.

[0058] Preferably, the automatic TIG welding equipment controls the welding of pre-processed food-grade titanium plates according to welding process parameters (welding current, voltage, welding speed, tungsten electrode diameter, welding wire diameter, etc.) to ensure the stability and consistency of the welding process. Simultaneously, it synchronously controls the three-gas protection structure according to three-way shielding gas flow parameters. Specifically, at the moment of arc initiation, the main argon gas protection channel is immediately opened according to the first flow parameter to provide protection for the arc area of ​​the welding torch. At the same time, the back auxiliary gas protection channel is opened in advance according to the second flow parameter, ensuring that the back of the weld is gas-protected before welding begins. Furthermore, the outer ring flexible drag shield protection channel also begins preparation according to the third flow parameter to ensure timely protection when the weld enters the slow cooling stage.

[0059] Preferably, during the welding process, the automatic TIG welding equipment monitors the welding status in real time and adjusts the parameters of the three shielding gas flows accordingly based on changes in the welding torch arc area, the back side of the weld, and the slow cooling area, such as adjustments to the welding speed, changes in the weld position, and temperature fluctuations. For example, if the welding speed is increased, the flow rates of the main argon gas and the back auxiliary gas are increased to ensure the shielding effect. At the same time, based on the temperature changes in the slow cooling area, the gas flow rate and shielding length of the outer ring flexible drag shield shielding channel are adjusted in real time to ensure that the weld receives appropriate gas shielding at different welding stages. After the welding is completed and the arc is extinguished, the main argon gas protection channel continues to provide protection for a period of time before closing; the back auxiliary gas protection channel continues to supply gas for a period of time according to the arc-extinguishing delay closing time set in the second flow parameters, in order to protect the back of the weld during the cooling process at high temperature; the outer ring flexible drag shield protection channel stops supplying gas after reaching the delayed protection length according to the weld cooling to the preset temperature, thus completing the gas protection task for the entire welding process; thereby providing all-round, multi-layer gas protection for the welding area, effectively preventing weld metal oxidation, ensuring weld quality, and meeting the welding quality requirements of food-grade titanium plates.

[0060] In the above text, refer to Figure 1 The three-gas synchronous welding control system for titanium metal welded pipes according to embodiments of the present invention is described in detail. Next, reference will be made to... Figure 2 A method for controlling the simultaneous welding of titanium metal welded pipes using three gases according to an embodiment of the present invention is described. The method for controlling the simultaneous welding of titanium metal welded pipes using three gases, such as... Figure 2 As shown, the method includes: determining the welding process parameters of an automated TIG welding equipment for processing pre-processed food-grade titanium plates into target titanium welded pipes; determining a three-gas shielding structure to cooperate with the automated TIG welding equipment; performing welding simulation of the target titanium welded pipe based on the welding process parameters to determine welding characteristic information, including the movement and thermal characteristics of the welding torch arc region, the back surface region of the weld, and the slow cooling region of the weld; predicting the demand for three-way shielding gas flow for the three-gas shielding structure based on the welding characteristic information to generate three-way shielding gas flow parameters corresponding to the welding process parameters; and synchronously controlling the three-gas shielding structure according to the three-way shielding gas flow parameters when the automated TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate through the welding process parameters.

[0061] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipe further includes: the pre-processed food-grade titanium plate is a titanium plate processed to a preset circular pipe diameter by a rolling machine, and the rolling machine works in conjunction with the automatic TIG welding equipment and the three-gas protection structure.

[0062] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipes further includes: the three-gas protection structure includes three protection channels, namely a main argon gas protection channel, a back auxiliary gas protection channel, and an outer ring flexible drag shield protection channel; wherein, the main argon gas protection channel is located in the TIG welding torch body of the automatic TIG welding equipment and is used to wrap the welding arc area, and the gas output position of the main argon gas protection channel changes with the welding position of the TIG welding torch body; the back auxiliary gas protection channel includes an internal blowing system for supplying argon gas with a preset purity to the target titanium metal welded pipe; the outer ring flexible drag shield protection channel includes a flexible shield installed behind the TIG welding torch and a gas source for blowing gas into the flexible shield, the flexible shield being made of metal or ceramic.

[0063] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipes further includes: sequentially extracting the movement and thermal features of the welding torch arc region, the weld back side region, and the welding slow cooling region from the welding feature information to generate arc region dynamic features, back side region dynamic features, and slow cooling region dynamic features; based on the arc region dynamic features, calling a preset main argon gas protection relationship library to perform real-time flow and pressure matching of the main argon gas protection channel to generate a first flow parameter; based on the back side region dynamic features, performing flow and delay matching of the back auxiliary gas protection channel to generate a second flow parameter; based on the slow cooling region dynamic features, performing flow and delay protection length matching of the outer ring flexible drag shield protection channel to generate a third flow parameter; and generating the three protective gas flow parameters using the first flow parameter, the second flow parameter, and the third flow parameter.

[0064] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipes further includes: delay matching including the time for gas protection to be turned on in advance before welding arc ignition and delayed after arc extinguishing; and protection length matching including the time length of gas protection in the drag shield area.

[0065] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipe further includes: determining the auxiliary gas addition temperature threshold for the back weld region; based on the preset pipe diameter and pipe length, taking the gas flow outlet of the back auxiliary gas protection channel as the starting point, analyzing the diffusion characteristics of the gas flow from the starting point to the outside of the pipe; determining the time and flow rate parameters for the gas protection to be turned on in advance before welding arc ignition based on the movement characteristics of the weld back region within the dynamic characteristics of the back region and the diffusion characteristics; determining the heat dissipation characteristics of the pre-processed food-grade titanium plate, and determining the delayed shutdown time after arc extinguishing by combining the thermal characteristics of the weld back region and the auxiliary gas addition temperature threshold; and generating the second flow rate parameter using the advance opening time, flow rate parameter, and delayed shutdown time.

[0066] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipes further includes: receiving a preset weld cooling temperature; using the dynamic characteristics of the slow cooling region as a starting point and the preset weld cooling temperature as an ending point, performing cooling time matching based on heat dissipation characteristics to generate a delayed protection length; and based on the delayed protection length, determining the flow parameters and generating the third flow parameters, with the constraint that the protective gas concentration inside the flexible cover in the outer ring flexible drag cover protection channel meets a preset concentration threshold.

[0067] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipes further includes: collecting welding modeling data from the automatic TIG welding equipment to construct a twin welding model; inputting the welding process parameters into the twin welding model to simulate the welding process; and extracting the movement and thermal characteristics of the welding torch arc region, the back surface region of the weld, and the slow cooling region of the weld from the welding simulation results to generate the welding feature information.

[0068] In one possible implementation, the three-gas synchronous welding control method for titanium metal welded pipe further includes: the arc area of ​​the welding torch is the area where the arc contacts the metal during the welding process; the back area of ​​the weld is the area corresponding to the inner wall of the pre-processed food-grade titanium plate and the arc position; and the slow cooling area is the area where the welding operation is completed but has not cooled to the preset safe temperature.

[0069] The titanium metal welded pipe three-gas synchronous welding control system provided in the embodiments of the present invention can execute the titanium metal welded pipe three-gas synchronous welding control method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0070] Although this application makes various references to certain modules in the system according to the embodiments of this application, any number of different modules can be used and run on user terminals and / or servers. The various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy distinction between each other and are not used to limit the scope of protection of this invention.

[0071] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A three-gas synchronous welding control system for titanium metal welded pipes, characterized in that, include: The welding process parameter determination module is used to determine the welding process parameters of the automated TIG welding equipment for pre-processed food-grade titanium plates used to process the target titanium metal welded pipe. The three-gas protection structure determination module is used to determine the three-gas protection structure that works with the automatic TIG welding equipment. The welding simulation module is used to perform welding simulation of the target titanium metal welded pipe based on the welding process parameters, and to determine the welding characteristic information, including the movement characteristics and thermal characteristics of the welding torch arc area, the back side area of ​​the weld, and the slow cooling area of ​​the weld. The airflow demand prediction module is used to predict the three-way protective airflow demand of the three-gas protective structure based on the welding characteristic information, and generate three-way protective airflow parameters corresponding to the welding process parameters. The welding control module is used to synchronously control the three-gas protection structure according to the three-way protective gas flow parameters when the automatic TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate by the welding process parameters. The steps performed by the airflow demand prediction module include: The movement and thermal features of the welding torch arc region, the back side region of the weld, and the slow cooling region are extracted sequentially from the welding feature information to generate dynamic features of the arc region, dynamic features of the back side region, and dynamic features of the slow cooling region. Based on the dynamic characteristics of the arc region, the preset main argon gas protection relationship library is invoked to perform real-time flow and pressure matching of the main argon gas protection channel, and the first flow parameters are generated. Based on the dynamic characteristics of the rear region, flow rate and delay matching of the rear auxiliary gas protection channel are performed to generate a second flow rate parameter; Based on the dynamic characteristics of the slow cooling region, the flow rate and delay protection length of the outer ring flexible cover protection channel are matched to generate a third flow rate parameter; The three protective airflow parameters are generated using the first flow parameter, the second flow parameter, and the third flow parameter.

2. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 1, characterized in that, The pre-processed food-grade titanium plate is a titanium plate processed to a preset circular tube diameter by a rolling machine. The rolling machine works in conjunction with the automatic TIG welding equipment and the three-gas protection structure.

3. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 1, characterized in that, The three-gas protection structure includes three protection channels, namely, a main argon gas protection channel, a rear auxiliary gas protection channel, and an outer ring flexible drag shield protection channel; The main argon gas protection channel is located in the TIG welding torch body of the automatic TIG welding equipment and is used to wrap the welding arc area. The gas output position of the main argon gas protection channel changes with the welding position of the TIG welding torch body. The back auxiliary gas protection channel includes an internal gas blowing system for supplying argon gas of a preset purity to the target titanium metal welded pipe. The outer ring flexible drag shield protection channel includes a flexible shield installed behind the TIG welding torch and an air source for blowing air into the flexible shield. The flexible shield is made of metal or ceramic.

4. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 1, characterized in that, Delay matching includes the time for gas protection to turn on before welding arc ignition and the time for delayed shutdown after arc extinguishing; protection length matching includes the duration of gas protection in the drag shield area.

5. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 1, characterized in that, The steps performed by the airflow demand forecasting module include: Determine the auxiliary gas addition temperature threshold for the back weld area; Based on the preset diameter and length of the circular tube, the diffusion characteristics of the airflow from the starting point to the outside of the tube are analyzed, taking the airflow outlet of the auxiliary gas protection channel at the back as the starting point. Based on the movement characteristics of the weld back area within the dynamic characteristics of the back area and the diffusion characteristics, the timing and flow rate parameters for early activation of gas shielding before welding arc initiation are determined. The heat dissipation characteristics of the pre-processed food-grade titanium plate were determined, and the delay shut-off time after arc extinction was determined by combining the thermal characteristics of the back area of ​​the weld seam and the auxiliary gas addition temperature threshold. The second flow parameters are generated using the advance start time, flow parameters, and delayed shutdown time.

6. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 5, characterized in that, The steps performed by the airflow demand forecasting module include: Receive the preset weld cooling temperature; Starting from the dynamic characteristics of the slow cooling region and ending at the preset weld cooling temperature, the cooling time is matched based on the heat dissipation characteristics to generate a delayed protection length. Based on the delay protection length, and constrained by the fact that the concentration of the protective gas inside the flexible cover in the outer ring flexible cover protection channel meets a preset concentration threshold, the flow parameters are determined, and the third flow parameters are generated.

7. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 1, characterized in that, The steps performed by the welding simulation module include: Welding modeling data from the automated TIG welding equipment is collected to construct a twin welding model; The welding process parameters are input into the twin welding model to simulate the welding process. The movement and thermal characteristics of the welding torch arc region, the back side of the weld, and the slow cooling region are extracted from the welding simulation results to generate the welding feature information.

8. The three-gas synchronous welding control system for titanium metal welded pipes as described in claim 7, characterized in that, The arc area of ​​the welding torch is the area where the arc contacts the metal during the welding process. The back area of ​​the weld is the area corresponding to the position of the arc on the inner wall of the pre-processed food-grade titanium plate. The slow cooling area is the area where the welding operation is completed but has not cooled to the preset safe temperature.

9. A method for controlling the synchronous welding of titanium metal welded pipes using three gases, characterized in that, The method is applied to the three-gas synchronous welding control system for titanium metal welded pipes according to any one of claims 1-8, and the method includes: Determine the welding process parameters for an automated TIG welding equipment for pre-processed food-grade titanium plates used to process target titanium metal welded pipes; Determine the three-gas protection structure that works in conjunction with the automated TIG welding equipment; Welding simulation of the target titanium metal welded pipe is performed based on the welding process parameters to determine welding characteristic information, including the movement characteristics and thermal characteristics of the welding torch arc area, the back side area of ​​the weld, and the slow cooling area of ​​the weld. Based on the welding characteristic information, the three-gas shielding gas demand of the three-gas shielding structure is predicted, and three-gas shielding gas parameters corresponding to the welding process parameters are generated. When the automatic TIG welding equipment is controlled to weld the pre-processed food-grade titanium plate using the welding process parameters, the three-gas protection structure is synchronously controlled according to the three-way protective gas flow parameters.

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